drop function

Drop empty variables

Convert an mvp object which is a pure constant into a scalar whose value is the coefficient of the empty term.

A few functions in the package (currently subs(), subsy()) take a drop argument that behaves much like the drop argument in base extraction.

Function drop() is an generic, which is why the package calls setOldClass().

Function drop() was formerly called lose().

## S4 method for signature 'mvp'
drop(x)

Arguments

• x: Object of class mvp

Author(s)

Robin K. S. Hankin

See Also

subs

Examples

(m1 <- as.mvp("1+bish +bash^2 + bosh^3"))
(m2 <- as.mvp("bish +bash^2 + bosh^3"))

m1-m2         # an mvp object
drop(m1-m2)   # numeric